I don't know if this is a known bug, but this looks totally different when
rendered with the official povray and uvpova6 (downloaded yesterday):

camera { location <-9.9,8,-9.9> look_at y*3 angle 70 }
light_source { <5-7,9,-5>,1 }
difference
{ box { <-11,-1,-11>,11 }
  box { <-10,0,-10>,10 }
  box { <-3.5,3,9.9><3.5,8,11.1> }
  pigment { checker rgb 1, rgb .5 }
}
box
{ <-3,.001,-3><3,3,3>
  pigment { rgbf <1,1,1,.99> }
  finish { reflection .5 }
}


-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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